Drainage control system



Oct. 13, 1931. J. M. BARRETT I 1,827,453

DRAINAGE CONTROL SYSTEM Filed Sept. 1'7, 1928 2 Sheets-Sheet 1 ATT RN EYS N) s a Oct. 13, 1931. J, BARRETT 1,827,453

' RAINAGE coNTRoysYs'rEM Filed Sept. 17, 1928 2 Sheets-Sheet 2 INVENTOR ATTORNEYS Fatentedoc't. 1 3, 1931 i COMPANY; orcnnvnrannomo, A ooarona rrorrorD W R i v nRAr'mren fconrzaor; s'ysgrnrr Application iledseptembef 17, 1928. SerialNm-3C6y333g ,;Thisqinvention relates to yalve control 3" .sy em rid v c s; s ch s a use for .0

;, trolling valves for draining condensation I I 7 v v .efiect, saidme'ans controlling an intermediate 1 .fcontroller, such ,as a supplementary or relay from stealnlin esfieed water regulatingvalves 5 or ivalves forotlaer likegpurposes. While the 1Q drainage control systems, one usual form of includes; a tank i or receiver. lI1 Wh1Cl1 V the drainage is collectedandfroin which it,

yvith'yalves for any; 0f'theseus es,,as'Wellas control. system "may beQ-usedv in connectionothers,- it hasbeen illustrated and Wil'lv'bedel scribed with finorei particular reference to is discharged} at 1 intervals Whenever,.-a jsufii- ,cient quantity collects;

sire to ariations in; said- 'level.

2 0 The objectof the invention is t o provide a rvaly e control system which. is prompt inits r spon e to v ons niwa e h th n lagriwhich might permit excessive water'flow or loss of steam}; ,whichis adjustabletoiconthereby prevents fiutteringof thevalve 'or yalves. and the consequentwire I drawing, loss not steam-and like effects; which automatically and positively purges or scavengesthe system, and particularly the generator, of air 7 or non-condensable gases, so that it doesnot ,tive and which is not, interfered; with; by the i become airbound but remains fully operaperature. I

f QAnotherobject is to provide a generators control system in which theenerator. and. its associatedparts may be ma erupt asa sel'fcontained. unit capable of convenient installation in any 1 Valve v control system, with E the generator and control devices capable otbe- V ingf'made up and he tin stock inone; or two sizes eachcapable- 0 [handling a fairly wide a V y and closesthe valye, as'Will-more fully appear range of valve sizes, avoiding the past necessity. forpractically building-to order leach .Ycoritroller' tor'each I particular valve to be. r c gntrolled i Affurtherobjectis' to provide improved valvefcontrolmechanismin which the means- The r present system, utilizes-'- a 'so-called T fgenerater as a controller 1 for therdischarge 1 yalve, said f generator spanning the normal, ,wa'ter leyelin the receiver and being respon-g J V H p p o A I a complete' systemvas ,desrgned for drainage Idetailhereinatter. v. Fig. .1 isIa m'ore'or less;

illustr ati trol or re ulatethe possiblefluctuations;in r.l'evel; which is positive in operation and sensitive lerel 210651; 3 Y directly control or actuate thevalve, but, 210- controlvalve,which in.. turn controls the ap complishes its-controlling function by a relay I Y plication of the necessary forcesfto the main Water flow regulatingyalve; and'in connection' therewith an expansiblemetal bellows or motor for said relay valve, which bellows as ,protected'iagainst excessive pressures, Q either from the generator or as the result of seating movement or i' the relay valve;

Further obje ctsioffthe invention are in part obvious] and in ,part" illfappear nrore in In the drawings, diagrammatic; sectional View, illustrating the control; Fig. 2is a detail section, on a larger scale, of the relay control Valve; Fig.v 3 is a similar view offthe upper," end of the gen- The tank :or receiver, 1,, conventionally shoWn,Will'be understoodtore'ceive and collect the drainage from one "or :a series of conduits (not shown) It may have any desired or needtul capacity according to, thenature;

gone us ekof the invention asa feed Y waterregulator..IT

of thes'teamsystem to which itis"connected." The steam pressure of tlle system is of course effective in the receiver and as the drainage collects its leyel rises untilthebmainvalye 2 is opened in the discharge line 3 which car-k ries-the drainage to a sewer oryto a collector frornwhich it maybe returned to the boiler.

The present inventionproyides system for vcontrolling the main alve softhat yvhennthe level-0fcondensate: inthe receiverrises above. ,a normal. levellAA by a certain amount, said main. valyeis caused toopen and permit clischargefof the dondensationhntil its leveli'falls to a point Where the control again responds I hereafterl V is called a gene'rator in the sense that it produces or Varies the pressure of a fluid, variations in such pressure being utilized for'con trol purposes. The generator shown, marked generally 4, comprises an inner tubular member 5 around which is sleeved an outer shell 6 closed at its opposite ends so as to form a trapped generating chamber 7. The outer shell may be provided with suitable heat radiating means, such as thefins 8, as well as with a filling opening 9 closed by a plug 10' near its upper end, while at its lower end to the bellows by a fitting 13 in which is a' filling opening 14 closed by a plug 15. When the trapped chamber communicates by a pipe 11 with suitable motor means, such as an expansible metal bellows 12. Variations in pressure in said chamber are therefore effective to expand or contract the bellows, as

will be readily understood. The pipe .11 rises above the filling opening 9 and is connected the generator is installed the plug 10 is removed and a suitable vaporizable liquid, such as water, is poured in to fill the trapped cham ber, whereupon the plug 10 is restored to i closed position and the remaining parts of the system are filled through the opening 14,

which is then closed by its plug. Thereafter,

. replenishment of the liquid is made through rise and fall of the liquid in theinclined part of the pipe 5, thereby subjecting the liquid in the trapped generating chamber to the heating effect of the varying steam zone and the cooling effect of a varying water zone,,as

the water level fluctuates. For well known reasons the generator is usually placed at an incline to amplify the heat transfer effects,

and such effects more or less vaporize the liquid in the trapped generating chamber and produce expansion or contraction of the motive bellows, all as will be readily understood.

The connection of the generator to the re- "ceiver'to establish communication with the water and steam spaces of the latter i's preferably made in such manner as to insure that the generator will inevitably be set at the proper incline in a more or less standard position. end communicates by an upwardly arched 'gooseneck 16 with a vertical pipe 17 the two pipes 16, 17 being rigidly and more or less permanently connected, such as by a welded joint. At its lower end pipe 5 is connected by a union 18 to an open ended pipe 19 entering and extending nearly to the bottom of a cold water well or reservoir 20 consisting To this end the pipe 5 at its upper of a hollow cylindrical member provided with a valved blow-off connection 21 and provided with suitable heat radiating means, such as the fins 22, and communicating by a pipe 23 likewise rigidly connected as by welding, with the pipe 17. The pipe 17 serves as a support or base by which the generator and its connected parts are supported and the rigid connections of plpes 16 an'd 23 to pipe 17 establish a definlte standard relation between the generator and the supporting pipe 17. Therefore, in installing this control the pipe 17 is set vertically at any desirable place with a suitable indicating mark 24 thereon locatedat the desired normal water level AA of the receiver or boiler, and when in this position is suitably connected to the receiver or boiler 'above and-below the water line therein by suitable fittings,"such as the angle valves 25. Pipe 17, the generator and cooperating parts, including other parts'to be later described, therefore form a unit capable of being readily installed in any system to be controlled, with the certainty that all parts are in the proper position and functioning efficiently.

Pipe 17 may-alsofserve as the support for the relay control devices for the main valve,

such devices in the present-instance including the relay or pilot valve 26. The latter is supportedby a cross bar 27 carried by a pair of verticalrods 28 provided with'tubular spacers 29 and cross arms 30 attached to brackets 31 on the pipe support 17. Said rods extend abovean upper cross head 32 where they supportcompression springs 33 adjustableby nuts 34. The cross head 32 is slidableupon said rods and serves as the support to which the upper end of the ex pansible metal bellows 12 is attached. The lower end of said bellows has a concave central seat 35 for the upper end of an extension of the stem 36 of a two-way valve member 37, provided with upper and lower tapered valve portionscoop'erating with upper and lower seat members 38, 39 respectively. "The stem of the valve slides through an opening in the tudinally extending metering. slot or recess 10', thelower'end of which is tapered or I. graduated, as at 41. Between the upper and lower valve seats'the valve casing is provided witha chamber 42 in which the valve member 37 travels, said chamber being in communication by a pressure pipe 43 with a suitably supported expansible metal bellows 44.

Said bellows serves as the actuator for the valve to be' operated, which in the form shown in Fig. 1 is a drainage control valve. Therefore the lower end of the bellows is provided with an abutment seat 45 to receive the upper end of the stem 46 of the drainage controlling valve member 47. Said valve is upper seat member and inthe zone of its a travel therethrough is provided with a longi-' nos txnormallynioved.towardzopen position byfan 1 includes the usual cruciform' -z guiding [plug 49, above which is; a'taperedgportion $50 00- 7 operating with a seat 51 in the valve casing i t I of pipe 43, chamber 42,,ieham'berz59 and pipe 60. w Spring 48. therefore preponderates? and cross wall.

Reverting'to 0r pastime, chamber 52inthevalve casing above the seat lmember 38 communicates by ap pe 53 hav- :ing restricted ,orifice 54 with ;a p1ugf55 joined to the fitting 5,6 connecting pipesr5 and :16, Said-plug is provided with anzextensionp.57 threaded internally to receive'f a 7 long ,threaded purging tube 58 which 'i's :consequently adjustable longitudinallyend the 1 far end of which enters the, steam chamber -v sure and prevents the :va-lv'e vfrom: slamming to its seat; In theifinal position valve a en-s5 ber 37 is seated upon, theupper seat S'Saml v-recjeiverppressure is out 01f *df-rom they-relay in pipe 5. Chamberr52 therefore is in comnicates withthesteanr space in the receiver by way ofthe tube 58.

-g'l he' c-hamber'59 below the seat 3910f the relay valve communicates. byway of avent pipe 60 with exhaust,that isfeither withthe' i open atmosphere, or," as sh0wn, wi th-the' dis---.

' chargeside of the valve 2, so as toleadlto the outlet from the drainage control system any 1 liquid or condensate delivered to pipe 60; The operationisxas follows: Let it be assumed .that the entire system is in operation with the: waterin the receiver at thenormal water level AA, as fshown, and 5 that 1 the a and bellows 12 are'properly loadedwith a Under existing conditions, because the water level is not above normal,the drainagevalve 2ashould beand is-closed. It is held closed by the pressure-in the'bellows'l l', coming by way I "of pipe 43 itrom thev ch-amber 42,which is in communication' by "way 0f 'the'imeteringgroove 40 with pipe 53 leadingto the pipe 5 way of pipe' 16.; Also, under existing conditions the steam'zone in thepipe 5 above thenormal water level AA is effective upon the j -s1'tion' valve 37 =seatsupon the lower seat '39, V

as the water level in the receiver does not rise.

' Let us assume now-that the water level in the receiverr ses mmaterial amount, say to,

' the abnormal; high level BB. This fills the inclined portion of pipe 5 with water rising fromv the cold water well'20 byway'ofiextenbefore.

above the lower level foffthe receiveryl-but I nevertheless holds available? at all vtimes quantity of water subject to the cooling effect of the fins 22 'andth'erefore at a relatively low ttemperature. Consequently, the efi'eot'ofthe cooler water rising into pipe?) from the Water well is to condense the vapor in the itrapped'generator chamber 7 and reduce the si0n 19. The" Well 20, it will' be observed,'-lies 'munication with the pipe 5', and also commu t .trappedchamber .7, *the connecting pipe 11 and therefore su-bj ect'to receiver pressure'by and the water in pipe 5 is likewise effective T". The existing conditions will continueso long ib f'important efiects occur? In the first, place, the 'Inain' }va l've is pressure in said? chamber. and; itsrconnectled parts, including the expansible meta-l bellows 12'. Thedatter 'therefore;contractsfandthe stem of the relayvalveis moved-upwardly, by the efiect; of the lcompressionhspiring 2161i I As soon asva1ve-member37-T moves'amfi yifrom f the seat 39 the bellows l4 is ventedaby way raises the valve member 47: to lopeni-thermain dischargei valve Valve37zvmovesiflrp wardly fairly rapidly and: during Jitsamovetapering metering portion A1 of'thesgroove gradually cuts oil the flow 10f receiver pres valve chamber 42.

Ipressure-of course forcessout theliquid in-the 9o receiver through --the main drainage-waive.

The level'of liquid lowers in both-thereceiver and in pipe 5 until itkreaohesya point below thenormalvvater level, say-an; abnoi malrl c iw a Water-level CG. As this; level =i'scapproached the, steam zone in pipeb 1in.creases,\thereby subj eating :the liquid in the trapped:- ;cha' mbar 7- to, increasing heattransferxefiect from the steam and -to a. decreasing cboling efiebt fromithe waterin tube 5'. v ;.Fi-n-a1ly,t the:steam =zone prepon'deratespbyit's heat. transfer -'efi'ect and ,vaporizes asufiioient quantity ofet-he liq- .uid inthe'trapped chamber? t-o produce pre s- I sure suflicient to expand the bellows: 512, the abutment-end ;.0'15 whichrmoves down-" 105 twardly, preponderatingspring 61 'andi inov ingthe relay valve 37 downwardlygg During :thismovement there is a graduated fiowof receiver pressur'eith'rough the graduatedpor- .tion 41 ot'the metering-groove to the chamber 42, the flow increasing as the main-portion of the groove "isre'ached, and in thefinalpois closed and receiver pressure become'seflen t -1 -.;tive I from the chamber 42 'by wayofpipe 43 in the bellows 't lto expandfthe'sameend t overcome the spring 48 andthereby seatfth'e 'rnain f'valve member -47 and eutiofi' t-he disv charge "of water from P the receiver, in which" 3 Water collects until the cycle is repeated; as i 'Durin'g the operation ofthe cy cle, afniiinx, 'u ated -anjdparticularly is closed, by'receiver pressure, instead of by thepres'sure generated in the trapped chamber 7 1 Receiver ressure isusually ample so-{tlia't'the effective area of the bellows 44'may' be aminimum,' reducifig-" V operate the main valve.

Moreover, this arrangement, by insuring ample working pressure for the main valve,

- avoids unnecessarily wide fluctuations in water level in the receiver, although the working fluctuation may nevertheless be varied or adjusted within reasonable limits, by simple variation in the pressure of the relay valve operating spring 61 by its adjusting nut 62. This enables the relay valve to be accommodated to various conditions, such as to syswins in which the rate of collection of the e liquid in thereceiver varies. For instance,

where a given system is likely to receive large slugs. of water in the receiver 1, the spring 61 is adjusted with heavier tension, so that when the water rises in pipe 5 and exerts its r cooling effect upon the liquid in the trapped chamber 7 toreduce the pressure in the bellows 12, the preponderating effect of sprlng 61 is more prompt, thereby evacuating bellows 4A earlier in the cycle and more promptly affording relief for the receiver by way of the main valve 47. Likewise, when collection in. the receiver 1 is in smaller amounts or more slowly, the spring 61 may be relieved to slow up its response to open the main valve and drain the receiver. 1

Bellows 12 is made ofsuch capacity and said bellows and pipe 11 and trapped chamber 7 are so loaded with vaporizable liquid that the bellows will accept the. entire volchamber 7 without danger of rupturing or injuring the bellows. The occurrence of exjustable crosshead 32, which is the relatively fixed abutment against which the bellows 0perates. Said bellows, of course, moves the valve 37 downwardly to a positive seat. The

abutment 32 therefore is made yieldable againstthe pressure of springs 33 to permit extra expansion of the bellows beyond the valve seating point without injury to any part, and the operation may be regulated and controlled by adjustment of said'springs. Of course, pipe 11 may more or less bend or flex to accommodate itself tothe rising abutment. This control system also is self-purging or automatically' scavenging, due to the fact of, and also avoiding unnecessarily large di' aphragms and stronger parts, as 1s the case when generator pressure is used d1rectly to' ume of vaporizable liquid in the trapped bellows is mounted upon the vertically adthat during every cbi'n'plete cycle of opening and closing movements of the valve mechanism there is a-flow of vaporfrom the receiver byway of pipe 16 to the steam space in pipe 5, thence by way of thepurging tube 58 'to the chamber of the relay valve and thence to the vent tube 60, or firstbyway of slamming the'valve to its seat'is avoided.

Each time a pressure wave flows from the receiver to the pilot. valve and thence to the .venting discharge, it sweeps through the.., steam space within the generator and takes with it any air or non-condensable gas which might otherwise collect. Consequently, during all operations the steam space in the generator is filled with steam and cannot collect. a air and-so reduce the heat transfer effects as to render the device inoperative or decrease its efiiciency, as isthe case with prior con- 'structions. The purging tube 58, of course,

may be adjusted longitudinally to more orM less enter the steam space and enable it to be accommodated to varying conditions in the rate of collection of air or non-condensable gases and insure complete scavenging by more or less varying the way in which the wave of pressure sweeps through the steam chamber. This arrangement prevents abnormal drop of generator pressure to a point where the main valve is held open until steam flows through and escapes, and also prevents, a wire drawing of the valve seats. 5

Another advantage in the useof a relay valve for controlling the main valve is to avoid fluttering of the main valve or wire drawing of the seats. The operation'of the main valve byreceiver pressure is so posi- 11o tive that complete closing and opening operations of said valve are insured. The valve does not'flutter on its seat, and by proper adjustment of the pilot valve spring 61 extreme. fluctuations of level of liquid in the receiver may be avoided. The gooseneck 16 which connects the generator to the steam space of the receiver is of advantage because when the level of liquid... in the receiver rises above the mouth where the gooseneck l6 enters the pipe 17 then said gooseneck is in effect an upwardly arched chamber containing a trapped quantity of steam or vapor subject to the cooling effect of the outside atmosphere. Indeed, the gooseneclrmay be finned or otherwise provided with cooling means if desired. The result is that when said mouth is water sealed by the rising liquid the vapor in the goose-h, neck rapidly condenses and more quickly draws up intc the inclined part qfpipee the cooler wat'erj infthe inze 11'2( withia' jm'cref prompt responsefof thel'generatcr aridf [ciO'n-j denset cn Qfthe; a'1ekjr in, its'steam" space;

ij followed; of; .c'eiirse, a; mere promptjcc tractiori bf hell'cws 12 'afidtherespcnsethere tqby opening- Of the mm neck therefere dQes away W1 f-the lage ngre pq sep d r tc t 95generatorcjoiitrel' stems;

. y 7 The pilbt Valve mechahis h icehsiderable merit cf saidpiletfvalve Willi sub .l Ws A45 either to: the

. t crater chamber 7,} elimi iates 11 Wire drawing the seats cf the m'aiii valve and in surestha of whateth reQeQi-Ver with excess Water? McreeVer; it enfl 7 ables" the cqhtrclf system; to ?be adapted; for ether uses, cne's11'ch 1'1'se be ng-as a controlfor ajfeedlwatef fi ef In a drainagecontrcl syste (6 How away. Y'The "feed Water re alator difiers chieflyjfrom a draih'age c'ofitrol system in that when the level 91ft? ater ill the hoil er'rise's the main valve'imthe Water supply v 7 linelshquldibe 'ei'therrestript'ed 'or clesed tc Beth. central systems; are 'cdritrqlled by variaticns'iiithe levelbf lidiiidixljthe tank, either the receiver .cr the hdiler, but in Qne; case the I discharge "valve isjopen ed enc1' in;15he"oth'er case thesilpplyjvalve is closed. i

, "Figiatillustratesatvater'regfilatorprovided with a 'maiii supplyval qes actuated by the helloizvfs M s6 that'up or expansion of said bellows the talye is epeiied 'ratlier'than clc sed'.

special tenets-or the mitta ii/Later tube variety ,int ended tb'lberheated"exhaust .Q'a'ses produced from an 'ii termitte'nt" metallhrg'icali Or furnace operatitjrr. "It-maybees 4 s imed that the 'fir""efl ective upoh 'said tubes plays 1110611 them rah 'ihtervellof five mip' as and. than is-tame for amntervelbf one m iteral deo 9 1 Whetth fire is effective I then the times the waterlle fel rises,

wi 'ep mmld successive appli p f desirable to shpply'; brfeed Water th the boiler.

7 Control devices forthis'p lir'pese have not fuhc it-ironed efii i ently due to the Lag i bp'emeion, the response being o: tardy that the supply w liqiewb fletmea e aye nfi instead efbetween heats.-

. l f mayib m bled 3 v v j l$ d$0 thaf vi w: e m r,

' j fi h' l'b .themX gapressilre'injthereceivero to completeficel ap e. by .c n q'tii el i t ven Pi e;

smallchange in ressure inithe, trapped-gem t cohtifqlQ f system will take?- care erwise Weuldhause'fi06ding 0f the;

when theflevel" steam-same theris ig tvater- This contrcl'svstemis'sh fi nn ee,

the; next heat andicccur's during the liea-t By the present system the control devices are of'the same formail'lustrated at'ithe left in Fig. 1 and require no particularor] detailed? 9 description. It issu'flicient to say that when theleve'lof 'wateriin' the boiler drops atthe 5 end. Of "the; heat; practically the full -length d'f; of 'the inclined *pipe '5 is emptied of water,

exp'osihgthe entire lengthpf' the -'tra-ppe'd H chamber to'the steamimpipej5 andimmediately predu'cifigf expansion ifithe trapped y chamber".with-afquick opening offlthe pilot velveiahdwapid' flo of pressure hammer bdiler by'wayfef ooseneckid pipe 53 and 9.

chamber 42f'to the bellows 44, whiich movesover-and fully and wide1ye en the ain; I

valve" 65; immediately'supplyihg Water. As soon as the next heat occurs Water rises in the bbilerand also' in the pipe '5', which is'prompt-' 1y filled with co ler water cioming from the Well, 20, which immediately prqduces conden- V saticnin the trap ed chamber with a reverse 7 operation ofythepi1pt'va1ve and a quick clos-f ingof the main valve. fSiich a system, ap-' 9Q plied fcr feedfwater regulati0n, isalmost instahtly responsiveto rise and fall of water in r a the boiler and will supply feed water: when;

ever'the' boiler Water level-falls.

" Other" advantages ofthe inventiori will he apparent to thoseski'lled'inthe' art. f "What I elaim'is'f w 'I 1; The combination of a container: fer

Water and steam, a generatqr spannifig the normal Water level therein and'havinga pipecbmmunicating with the steam and Water spaces in said-container and a trapped-gene erator' chamber member in heat, conducting relaticn withfsai'd pipe,v'alye means c ontr ol- 1mg the water level in said cqntamer; a mov able abutment for 'actu ating said j valve,- c0'n'- meeting means for applying the eflt'ectofconf tainer pressure to" said abutment; and means I "centrclled by variati'olis the pressure in j 1 a said trappedchamber-"for:fiarying the appli t cation of said eflfect to'said abutment'fcr regs iilatingjactiiation ofsaid valve means. 'j 2. A c0'mbinatidn of the character described" in'cl'aim 1, in which said connecting means c'cnd'ucts 'c Ontainer pressure fer; effectin'the pipe Of said generatdr, to thereby piirge the samejof air orl noncondenseble gases; 3.-The ccmh'ination 'of a container-"Her.

trapped chamber-{and means forpurging the idensable gases during each operationxpfsaid valve mechan1 sm.'- 1

11 'ing said ahutmentby way ofthe steam-space 4. The combination of a container for; water and steam, a generator spanning the normal water level therein and, including a pipe communicating with the steam and forventingthe same, and automatic means foractuating said valve means.

f5. The combination of a container for water and steam, a generator spanning the normal water. level therein "and including "a 7 pipe communicating with the steam and water spaces in said container and a trapped generating chamber member in heat-conductlng relatlon with said pipe, valve means communicating with the steam space in said pipe means. V

" for venting the sameyand automatic intermeans for operating said mittentlv actuating valve means.

6. The combination of a container forwater and steam, agenerator spanning the normal water levelthereinandincluding a pipe communicating with the steam and water spaces in said container and a trapped generating chamber member in heat conducting relation with said pipe,'valve means commiinioating with the steam space in saidpipe for venting the same, and means actuatedby variations in pressure in saidtrapped generating chamber for actuating said valve 7. i The combination of a container for water and steam, a generator spanning the normal water level therein, andincluding a pipe communicating with the steam and water spaces in said container and a trapped generating chamber member in heat conducting relation w th said pipe, valve means communicating with the steam space in said pipe for venting the same, and means actuated in accordance with variations. in level of the liouid in saidcontainer for actuating said valve means. j i

8. The combination of a container for water and steam, a-'generatorspanning the normal water level in said container and'ineluding a pipe communicating at its lower endwith the water space in said" container and atits upper end being provided with an upwardly arched gooseneck communicating with-the steam space in said" container and also witha vent pi pe, said generator also havinq atra ed enerating chambermember in heat conducting relation with said pipe, and valve mechanism controllingthe flow through said vent pipe and actuated by variations in pressure in'saidtrapped chamber.

9. The vcombination of a container for water and steam, a generator spanning the normal water level therein and including a pipe communicating with the steam and water spaces in said container anda trapped generating chamber member in heat conductingrelation with said pipe, and a valve con trolled vent pipe having a purging member densable gases byactuation of the valveto open the vent pipe.

10. A combination of the character de scribed in claim 9, in which said purging 7 member is adjustable to open at various levels in the steam space of said generator pipe. e

the waterlevel in containers,comprising a conduit adapted for connection to a con-' tion with said conduit, including a pipe communicatlng with the steam and water spaces of said conduit and lving at a definite inclination to the vertical, a trapped generating chamber member associated in heat conducting relation with said pipe. a frame attached to saidv conduit, a valve and :a movable abutment carried hv said frame. and a conduit connecting said. trapped generating chamber and movableabutment for actuating the lat ter'.fwherebv said unit with its conduit, gen-. erator, movable abutment and valve: parts, mav bodilv be installed in or removed from a container svstem. 12. A generator control unit-forregulating the water level in containers. comprising a conduit adapted for connection to a container in vertical position and in standard relation with and spanning its normal water level; ie enerratin! control means in'fixed relation with said conduit. includina'a pipe communicating with the steam and water spaces of sa d conduit and lving at a definite inclination to the ertical. a tra ed QGDGT- atino' ch amloer memher associated in heat conductin relation wi h said p e, arf ame at tached to said'conduit. a. valve and a mov= alole abutment carried bv said frame, a conduit controlled hv said valve and communicatin with the steam space in'said pipe. and a. c nduii connecting the movable abutment an o'eneratino eh'amher, wherebv said unit ith its conduit, enerator. mo ablwaloutment and valve parts mav bodilv be in-v sta led .in or removed from aconrainen system. Q 13.,The combination ofvla container for water and steam, a generator spanning the normal water level thereinand, includingja pipe communicating with the steam and water spaces in said container and a trapped pilot valve and actuated by variations in pressure in said chamber and adapted upon in- .11. A generator control unit for regulating I sir its

iis

generatingchamber member in heat conducta crease in such pressure to move the pilot Valve in one direction, yielding means for moving n y the pilot Valve in the opposite direction, and means for adjusting the tension of saidyieldring means, said pilot valve-being provided 1' With graduatedmetering means for varying its effect upon the main valve. 7 i Y In testimony whereof lhereby affix my signature. i 1

JOSEPH M. BARRETT. 1 I 

